The profile of UVA、UVB、UVC、UVD
The individual wavelength within the ultraviolet light are believed to have an effect on health. the ultraviolet ray divided into four set of wavelength base on different effects of biological.
UVA
The UVA is long wavelength ,wavelength is nm between 320～400,also call long wavelength black spit effects of ultraviolet ray. the UVA with the powerful penetrating. the glowing uv led strip showed that the rays could pass not only through grass but also through nine feet of water .
UVB
The UVB is middle wave ,wavelength is nm between 275～320,also call middle wave red spit effects of ultraviolet ray. the UVA with the middle penetrating. it only a fraction of the ultraviolet light through grass.
UVC
The UVC is short wave ,wavelength is nm between 200～275,also call
short wave sterilization of ultraviolet ray. the UVA without penetrating(or weak penetrating). the ultraviolet light can’t through grass.

Infrared heating transmitted the energy
The waves of ir led strip can transport both energy . we have seen how to deal with energy using infrared led.
The energy that atoms and molecules can cause to move or shake by heating.
the atoms and molecules doesn’t only contain  degrees of freedom . it also include that heating of the vibrational degrees of freedom. vibration intensified of the atoms and molecules when it temperature increase with pressurethe wavelength of vibrational happened to be in the Infrared range 。In addition, the thermal effects of Infrared mean this frequences equals or is close to the frequences of Infrared, it can cause resonance, meanwhileInfrared which transmits energy by impact.According to the above-mentioned principle ,we now understand that
resonance production of infrared heat effect 。

Infrared heating transmitted the energy

The energy that atoms and molecules can cause to move or shake by heating. the atoms and molecules doesn’t only contain degrees of freedom . it also include that heating of the vibrational degrees of freedom. vibration intensified of the atoms and molecules when it temperature increase with pressure the wavelength of vibrational happened to be in the Infrared range 。
In addition, the thermal effects of Infrared mean this frequences equals or is close to the frequences of Infrared, it can cause resonance, meanwhile Infrared which transmits energy by impact. Infrared radiant heating system according to the principle.

Why did the heat dispersion fail?

In LED lighting, The designer will consider that heat dispersion with their experience. the heat dispersion is major problem for LED design 。

we have a few strange phenomenon during use. may be caused by heat dispersion . so what reason for heat dispersion fail? Here is three key point:

1.thermal resistance was too large and the metal-insulator transition temperature ( Tp) becomes unmeasurable. so led source’s not giving out any heat.
2.In design ,use the aluminium based plates to connecting led source. the aluminium based plates had multiple thermal . so led source’s not giving out any heat.
3. The designer have not set aside for heat dispersion buffer. so led source’s not giving out any heat.
Stated thus, good treatment measures for heat dispersion is necessary in design .

The power socket sparked
The LED switch power is fully inserted before the power socket with a spark. the users who worried about electricity safely problems .all right, in order to know that problem of power spark.

we will take the work process from there。

First the 110V AC have come as power supply, first by Rectification with diode, then the 110V changed into 155V（110*1.414≈155V）by filter capacitor。In order to ensure the output power stable，choice capacitor should choose capacity of course big, in here we got to the root of the sparked problem. Namely the capacity will need stocked a lot of electric energy. then the plug connections has created sparked. This is all part of the power input mode.
But then insert again within seconds., the spark disappears. in a words the charge and discharge of capacitor, the energy process of electric spark..

Special Method for Measuring Fine LED Wire Diameter
The wire of contacts is1-pin to19-pin .in my last article, is about how to measure the diameter of a little ball(single pin) with an vernier caliper. Here is a test result of multi-core cable .

10mm2  7 pin  single core diameter as 1.33㎜
16mm2  7 pin  single core diameter as 1.68㎜
25mm2  7 pin  single core diameter as 2.11㎜
35mm2  7 pin  single core diameter as 2.49㎜
50mm2  19 pin  single core diameter as 1.81㎜
70mm2  19 pin  single core diameter as 2.14㎜
95mm2  19 pin  single core diameter as 2.49㎜

Special Method for Measuring Fine LED Wire Diameter
The led connected next led through copper wire . Is there some kind of method that LED Wire Diameter? Yes we are got a simple way to Measuring Fine LED Wire Diameter. Methods to measure the LED wire diameter by vernier caliper, An simply way of doing this would be the following:

The measurements are extraordinarily accurate

1mm2     diameter as 1.13㎜

1.5mm2     diameter as 1.37㎜

2.5mm2     diameter as 1.76㎜

4mm2     diameter as 2.24㎜

6mm2     diameter as 2.73㎜

The LED constant voltage source to compare constant currently source

Drive the LED
This article investigates and compares different way for LED. They were Constant voltage and current limiting resistor.

We are know that the led VF has dropped When the temperature of LED is raised, If this time, with Constant voltage source to drive the LED as time continuous work current will be bigger .. If you use the resistor to limiting current ,right now in the circuit the current is not changed basically(because the resistor also share a part of the currently and temperature).

Medical LED

The led light possesses therapeutic effects, A few examples will make the point clear, can adjust nutrient metabolism and improve the circulation and endocrinological changes through different wavelength and different strength of light to timulates neuronal system and reticular formation of brain stem . but it also has regulation of physiological cycle, and improvement of related symptom .
LED has a certain effect on the Clinical Application of mental illnesses. mainly related todepression、Insomnia or other sleeping disorders such as.